Portable drill.



H. J. & T. P. KIMMAN.

PORTABLE DRILL. APPLIGATIONIFILED mama, i913.

1, 1 1 2,070, 7 Patented Sept. 29, 1914.

4 SHEETS-SHEET 1.

H; J. & T. I KIMMAN. PORTABLE DRILL.

APPLICATION FILED MAR.2B, 1913 1 1 1 2 ()70 Patented Sept. 29

4 SHEETS-SHEET 2.

Ill/ll III IAIli/ I I II I 2 r 5 I 5 I F I 1 IL-J. & T. P. KIMMAN.

PORTABLE DRILL.

APPLICATION FILED M12128, 1913.

4 SHEETS-SHEET 3.

Vim-"1 2691% MSW H. J. & T. P. KIMMAN PORTABLE DRILL.

APPLICATION FILED'MAR.28, 1913.

1, 1 12,070; Patented Sept. 29, 1914.

' 4 SHEBTSSHEET 4. I

I K72067122 r15 Wmn/W JCL. meek UNITED STATES PnrENT OFFICE.

HENRY J. KIHKAN AND THEODORE P. KIMMAN, OF CLEVELAND, OHIO, ABBIGNOBS 1'0 CHICAGO IPNEUHATIC TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

:eon'rannn mum.

Specification of Letters Patent.-

Patented Sept. 29, 1914.

To all whom it may concern: H

. Be it known that we, HENRY J. KIMMAN and THEODORE P. KIMMAN, citizens of the United States, vresiding at Cleveland, Cuyahoga county, Ohio, have invented certain new and useful Improvements in Portable Drills, of which the following is a, specification.

' Our invention relates to portable power drills actuated by fluid pressure, more usually butnot necessarily compressed air, and more especially to that type known as a close-quarter or corner drill in which the drill spindle is arranged at one end" of the machine to enable the same to be used in close quarters and with the engine portion of'the machine at a distance therefrom and with intermediate driving connections.

Theobject of our .invention is to provide novel, etficient and reliable driving connections between the prime mover such as the fluid pressure operated engine or engines and the drill spindle whereby the reciprocating movement of the pistons of the engines is converted in an eflicient and economical manner into the required rotary movement of the drill spindle.

Our construction and arrangement of drilling machine is such that means may be applied to the engine mechanism whereby the motion of the drill spindle may be reversed at will.

Speaking in general terms, our drilling machine comprises a pair of engines with reciprocating pistons connected to a crank shaft, a secondary or counter shaft arranged substantially parallel to the crank shaft and actuated thereb and novel driving connections between t e secondary shaft and the drill spindle including differential gears actuated by the secondary shaft and ar-' ranged to operate a sprocket device, and a chain drive between such sprocket device and the drill spindle.

In the drawings Figure 1 is a central vertical sectional elevation of our new drill; Fig, 2 a top plan view thereof with a cap removed and also a portion of one of the engines broken away;. Fig. 3 a section on the irregular line 33 of Fig. 1 looking in the direction of the arrows; Fig. 4 a view of the fen 'neend of the machine; 5 a section 0 the line of I12. 1; Fig. 6' a detail view ofjthedifierential gear var or carrier; Fig-.- 7 a section on the line =7 of Fig. 6; and Fig. 8 a section illustrating the rear end of the main casing and valve mechanism modified for the employment of reversing mechanism. I

In so far as our present invention is concerned, the prime mover or engine may be of any well-known or desired construction and while we have herein shown a certain specific construction of engines, including their valve mechanism, we do not intend to be understood as limiting ourselves thereto. Moreover, while we prefer to operate these engines by compressed air, yet it will be understood that any other desired motive fluid may be employed.

Our drilling machine as herein shown comprises a main casing or housing 1 containing most of the working parts of the machine and having its forward end fashioned to receive the drill spindle as hereinafter explained, To the rear end of this main casing there is secured by means of the bolts 2, a supplemental casing 3 which contains the piston chambers 4 of the two engines and the valve chambers 5 as well as the main inlet connection 6 connecting with a source of motive fluid supply.

Inasmuch as the details of the engine construction are immaterial so far as the present invention is concerned, it will suffice to say that the movements of the two pistons 7 which are of the double acting type operating in the chambers 4 are controlled by the reciprocating valves 8 operating in the valve chambers 5 and themselves 0 erated by eccentric connections with the crank shaft as hereinafter explained.

The piston rods 9 extend forwardly through. the front ends of the piston chambers and are connected to cross-heads 10 sliding in guides formed by the tubular extensions 11 of said front ends of the piston cylinders.

In suitable bearings in opposite walls of the housing is mounted a crank shaft-12 "provided with quartered cranks connected by means of the connecting rods 13 with the wrist pinsf14 at the front ends of the piston rods. At its central portion the crank shaft is provided witb'eccantrics 15 connected with the valves by means of the eccentric straps and rods 13, it bdmunderstood that these eecendtlzrcshmd d are properly lrelated ino attev vamayproper" trial the and the exhaust ii??? upper end of this crankshaft is journaled in a similar roller bearing 19 which is received within a recess 20 in the top wall of the casing which in the present instance is a removable cap or plate 21 secured to the main casing by the screws 22.

In a plane parallel with the (plane or axis of the crank shaft and forwar ly thereof is positioned a secondary or counter shaft 23 which is driven by such crank shaft through the medium of a driving gear 24 preferably formed as a part of the crank shaft and a driven gear 25 preferably formed as a partof the secondary shaft. The upper end of this shaft is journaled in a bearing 26 received in the recess 27 of the cap plate 21 and its lower end is journaled in a similar bearing 28 received within a recess 29 in the bottom wall of the main casing.

' The secondary shaft is provided near its lower end with an eccentric 30 preferably formed as an integral part therewith and received within a hollow differential gear 31 between whose inner surface and the eccentric is arranged a series of rollers 32 forming bearings therefor. This differential gear is mounted in a lever or carrier 33 having the peculiar. formation illustrated in Figs. 5. 6 and 7 wherein it will be seen that it is of irregular shape and provided with the three openings 34, 35 and 36. The opening 34 has internal teeth corresponding with and receiving the exterior teeth 37 of the differential gear, whereby this gear and its lever or carrier are-held in firm engagement but are removable one from the other for therewith. The thir opening 36 is adapted to receive a roller 38 rotatable on a stud 39 "secured in the bottom wall of :the casing,

the stud 38 having a top marginal flange to hold the lever 33 against displacement. The opening 36 is elongated in order that the lever or carrier may have a reciprocating and oscillating movement as hereinafter explained.

The differential ear 31 extends upwardly within another di erential ar 40 having an internal setof teeth .41 an in the present instance formed integral; with a sleeve 42 surrounding the secondary shaft and provided at its central portion with sprocket teeth 43. The upper end of this sleeve is journaled in ball bearings 44 within the flange portion of the gear 25. The roller bearings 45 are interposed between the central portion of the secondary shaft and the interior of the sleeve as seen in Fig. 1.

The driving differential gear 31 has a movement eccentric of the driven difi'erential gear 40 and in the reciprocations of the secondary shaft, such driving gear is given a wabble movement with the result that its external teeth 37 will engage the internal teeth 41 at one side and such point of meshing will move around in the eccentric movements of this driving gear, thereby acting as a reduction gearing and causing the motion to be communicated to the driven gear and consequently to the sleeve 42 and its sprocket 43. As stated the two gears 31 and 40 are differential gears and while the particular number of teeth employed is not essential, we prefer to provide the driving gear 31 with twenty-four teeth and the driven gear with twenty-six teeth.

The sprockets 43 have driving connections with the drill indle 46 by means of the drive chain 47 w ich engages sprocket teeth 48 formed on the drill spindle intermediate its length. The reciprocating movements of the engines are thus communicated -to the spindle and are transformed into rotary movement for the proper actuation of such spindle.

The drill spindle may be mounted in the mam casing in any suitable manner but that herein shown is preferred. The lower end of the spindle is rotatable within a sleeve 49 between which and the sleeve are interposed a packing nut 50, a packing 51 and also the roller bearings 52. The upper end of the spindle is gournaled in the ball bearings 53 and provi ed with a thrust bearing collar 54, ball bearing 55 and a thrust bushing 56 secured in the upper end of the main casing. A feed screw 57 screws into thisbushing and constitutes the means for feeding the working tool to its work.

In Fig.- 8 we have illustrated the use of reversing mechanism wherebv the machine mav be reversed at will. According to this construction the valve chambers communicate with the ends of a U-shaped casting or manifold 58 containing inlet and exhaust ports and passages which are controlled by the reversing valve 59 contained within the bore of a tubular extension 60 secured to said manifold. Each arm of this manifold is provided-with a passage 61 which, in the particular position of the reversing valve shown, is an inlet passage. Referring to the ports in connection with the lower arm of the manifold, the passage 61 communicates with the valve chamber through a port 62 for admitting the motive fluid through the valve chamber, through ports 63, assage 64 and port 65 into the front end of the piston chamber. Also each branch or arm of the manifold has a passage 66 which, in this position of the valve, is an exhaust assage, so that the exhaust from rear end of the lower piston chamber may flow through the ports and passages 67, 68 and 69 at the rear endof the piston chamber, through port 70 and thence through passage 66 to the reversing valve. The port 70 communicates with the port 71 by means of the passage 72 shown in dotted lines, so that the port 70 may be caused-to communicate through the medium of the valve with the port 67 in the admission and exhaust of the motive fluid.

The corresponding ports and passages in the upper arm of the manifold and the upper piston chamber have the same reference numbers.

The reversing valve has at its forward end a groove 73 for connecting the passages 66 with the exhaust ports 74 leading direct to the atmosphere. In addition the reversing valve which is in the form of a hollow stem receiving the motive fluid at its outer end 75 is provided with a series of radial admission ports 76 which are adapted to communicate with the passages 66 when the valve is reciprocat'edlto the proper position. This valve is reciprocated by means of the knurled sleeve 77 fitting u on the extension 60 and having a pin an slot connection with the reversing valve so that when the sleeve 77 is oscillated the reversing valve is reciprocated. When this valve is in its out- Ward position as shown in Fig. 8 the groove 73 will communicate between the exhaust ports 74 and the passages 66 and the central su ply passage 78. in the reversing valve ad 1 communicate directlywith the-passages 61 which latter will then act as inlet passages while the passages 66,will act as exhaust passages. When, however, the reversmg valve is reclprocated to inward posltion,

the groove 7 3 will connect the exhaust ports 7% and the passages 61 and the inlet port 76 will communicate with the passages 66. At this time the passages 66 will act as inlet passages and the passages 61 as exhaust passages, The pin and slot connection between the sleeve 77 and the reversing valve comprises the inclined slots 79 extending through the sleeve 77 and longitudinal slots 80 in the sleeve 60 and bushing 81 and a pin '82 secured to the reversing valve and movable in said slots when the sleeve 77 is oscillated.

We claim:

1. In a drilling machine-{the combination, with a rime mover and drill spindle, of intermediate driving connections therebe- .tween comprising a rotatable shaft actuated by the prime mover reduction gearing operated by the shaftilicluding an eccentric actuated by the shaft, agcar operated by such eccentric, means for mounting said gear for oscillating andlateral movement, a second driven by the first mentioned gear, and means for transmitting motion from thesecond gear to the spindle.

. 2. In a drilling machine, the combination, with a prime mover and drill spindle, of intermediate driving connections thercbetween comprising a rotatable shaft actuated by the prime mover, 'reduction gearing operated by the shaft including an eccentric actuated by the shaft, an external toothed gear operated by the eccentric, means for mounting said gear for oscillating and lateral movement, an internal toothed gear mounted concentric of the shaft and arranged to mesh with and to be driven by the other gear, and means for transmitting motion from the sec ond mentioned gear to the '5 indie.

3. In a drilling machine, t e combination. with a prime mover and drill spindle, of intermediate driving connections therebetween comprising a rotatable shaft actuated by the prime mover, reduction gearing operated by the shaft including an eccentric actuated by the shaft, a gear operated by such eccentric, a lever in whlch the gear is mounted and which is itself mounted for oscillating and lateral movement, a second gear operated by the first gear, and means for transmitting motion from the second gear to the spindle.

4. In a drilling machine, the combinat on with a prime mover and drill spindle, of intrmediate driving connections therebetwcen comprising a rotatable shaft actuated by the prime mover and having an eccentric, a gear 1 operated by such eccentric, a second gear surrounding the first gear and driven thereby, a lever in which the first gear is mounted and which has a combined reciprocating and oscillating movement, and driving mechanism between the second gear and the spindle.

5. In a drilling machine, the combination with a prime mover and drillspindle, of m-' .termediate driving connectionstherebetween comprising a rotatable shaftactuated by the prime mover and having an eccentric, a gear operated by such eccentric, a second gear surrounded the first ear and driven thereb a lever or carrier aving an opening provided with gear teeth to receive and hold the first gear, and driving mechanism between the second gear and the spindle.

6. In a drilling machine, the combinat on with a prime mover and drill spindle, of in- -termediate driving connections therebetween comprising .a rotatable shaft actuated by the prime mover and having an eccentr1c, a gear operated by .such eccentric, a second gear & surroundin the first gear and driven thereby, a lever in which the first gear is mounted and which has a combined reciprocating and oscillating movement, a casing in which said prime mover and connections are arranged,

gear mounted' concentrie-of the shaft and said lever having a. pin and slot connection &

with the casing, and driving mechanism between the second gear and the spindle.

7. In a drilling machine, the combinationwith a prime mover and drill spindle, of interu'iediate driving connections therebetween comprising a rotatable shaft actuated by the prime mover and having an eccentric, a gear. operated by such eccentric, a second gear surrounding the first' gear and driven thereby, a sprocket connected with the second gear, and a drive chain between such sprocket and the spindle 8. In a drilling machine, the combination with the prime mover and drill spindle, of intermediate driving connections therebetween comprising a rotatable shaft actuated by the prime mover and having an eccentric, a gear operated by such eccentric, a'second gear surrounding the first gear and driven thereby, a sleeve surrounding said shaft and connected with the second gear, a sprocket on the sleeve, and a drive chain between said sprocket and the spindle.

9. In a drilling machine, the combination -with the prime mover and drill spindle, of

HENRY J. KIMMAN. THEODORE P. KIMMAN.

Witnesses:

SAMUEL E. HIBBEN, WALTER Ln Ror Fnonr. 

